Which numbered areas of the graph represent phase changes? A graph shows temperature on the y axis and heat on the x axis. A line with a positive slope representing solid proceeds a point, and this segment is labeled 1. The line is horizontal for another segment, labeled 2. The line then proceeds with another positive slope representing liquid, and is labeled 3. This is followed by another horizontal line segment labeled 4. There is a final line segment with a positive slope representing gas labeled 5. Select one: 1, 3, and 5 2 and 4 None 1, 2, 3, 4, and 5 4 and 5 only